Machine element or mechanism – Rotary member or shaft indexing – e.g. – tool or work turret – Preselected indexed position
Patent
1989-07-20
1991-12-03
Herrmann, Allan D.
Machine element or mechanism
Rotary member or shaft indexing, e.g., tool or work turret
Preselected indexed position
475128, B60K 4106
Patent
active
050690876
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
The present invention relates to a clutch changeover circuit for a non-stage transmission, and more particularly to a clutch changeover circuit suitable for use in a multi-stage type stationary hydraulic mechanical non-stage transmission.
As a multi-stage type stationary hydraulic mechanical non-stage transmission, the one having the arrangement shown in FIG. 1 is generally known. In this transmission, an input shaft 1 and an output shaft 2 are connected to each other via the following: a planetary gear P1 for accelerating the mechanical input of the second speed, a synthetic planetary gear P2 for a mechanical drive system and a hydraulic drive system for the second and fourth speeds, and a synthetic planetary gear P3 for a mechanical drive system and a hydraulic drive system for the first, second, third, and fourth speeds. A variable-discharge-capacity pump 3 driven via gears 5, 6, 7 as well as a volume-fixing motor 4 driven by this pump 3 are connected to the input shaft 1. The output of the pump 3 is transmitted to a sun gear 52 of the synthetic planetary gear P2 via gears 8, 9, 10 and to a sun gear 53 of the synthetic planetary gear P3 via gears 8, 9, 11, 12. These gears are provided with clutches for changing over the speed stage. Specifically, a clutch C1 for the first speed is provided for connecting or disconnecting the rotation of a ring gear R3 of the synthetic planetary gear P3 on the output shaft 2 side, and a clutch C2 for the second speed is provided for connecting or disconnecting the rotation of a ring gear R1 of the planetary gear P1 on the input shaft 1 side. Furthermore, a clutch C3 for the third speed for connecting or disconnecting the transmitted rotation from the input shaft 1 is provided on a shaft member 13 which connects together the ring gears of the synthetic planetary gear P2 and the synthetic planetary gear P3, while a clutch C4 for the fourth speed for connecting or disconnecting the transmitted rotation from the input shaft 1 is provided on an arm 14 which connects together the planetary gears of the planetary gear P1 and the synthetic planetary gear P2.
In such a transmission, since a speed change is effected at a point where there is no difference in the relative speed with respect to the following-stage clutch, it is possible to change the speed-change stage in which there is no shock which is caused by the changeover of the clutch.
In addition, the speed change is always effected in the order of the respective adjacent speed stages and is not effected by jumping a midway speed stage.
A hydraulic circuit such as the one shown in FIG. 2 (Japanese Utility Model Application No. 151193/1984) is used to effect a changeover among the clutches C1, C2, C3, and C4 with respect to the above-described transmission. This circuit is so arranged that oil circuits for the respective clutches C1, C2, C3, and C4 are provided to a hydraulic pump 101 in parallel, and pressure regulating valves 111, 121, 131, 141, reducing valves 112, 122, 132, 142, and clutch changeover valves 113, 123, 133, 143 are disposed in these oil passages in the order mentioned from the upstream side, the clutch changeover valves being respectively opened and closed by solenoid valves 114, 124, 134, 144. Hydraulic pressure from the hydraulic pump 101 acts on each of the solenoid valves via a reducing valve 102 serving as a pilot valve, the clutch changeover valve is actuated upon activation of the solenoid valve, and a corresponding clutch is adapted to operate. Hydraulic oil from the hydraulic pump 101 is returned to the tank 100 via a pressure regulating valve 103.
In accordance with such a hydraulic circuit, since the pressure regulating valves 111, 121, 131, 141 are provided in the oil circuits leading to the respective clutches C1, C2, C3, C4, it is possible to prevent the pressure of the presently engaged clutch from falling, until a following-stage clutch is engaged during a speed change. Hence, it is possible to obtain an advantage in that the clutch engaging period can be minimi
REFERENCES:
patent: 4535681 (1985-08-01), Nakamura et al.
patent: 4831899 (1989-05-01), Honig
patent: 4934218 (1990-06-01), Takase et al.
Ishino Tsutomu
Maruyama Ryoichi
Herrmann Allan D.
Kabushiki Kaisha Komatsu Seisakusho
Massey Ryan
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